Here's my list for my Assassin themed deck with over half the creatures being Ninjas, Assassins, or Rogues.
I choose the assissin
Ramses Overdark since I like obscure generals and he seemed like a fun one. Besides my playgroup already has a
Thraximunder player. Please feel free to make any constructive comments. As of right now the deck has not been tested. When creating the deck I generally like to follow a skeleton of at least: 5 card draw, 5 mass removal, 5 removal, 5 counterspells, 5 mana ramp, 5 win conditions. This usually ends up being about 40 cards though and I use the remaining 20-22 slots for the theme.
General:
Ramses OverdarkOn theme cards (8):
Higure, the still windNinja of the deep hoursthada adel, acquisitorsilent-blade oniink-eyes, servant of onisakashima's studentsakashima the impostorokiba-gang shinobiMana ramp (5):
Wayfarer's BaubleDarksteel Ingotsol ringdimir signetthran dynamoMass removal (5):
Knowledge ExploitationBlack Sun's Zenithdecree of paindevastation tideevacuationTargeted removal (4):
Royal Assassinthroat slitterbig game hunteravatar of woeDraw (6):
Seer's sundialCrystal BallOverwhelming intellectlim-dul's vaultsensei's divining toprhystic studycounterspells (5):
hinderfoilspell crumplerewindpact of negationHaste givers (5):
strider harnesssword of vengeancehelm of kaldralightning greavesswiftfoot bootsAura's (10):
Despondencydragon shadowdragon wingspemmin's aurafreed from the realshade's formfalse demisefool's demisedominating licidleeching licidFun cards (10 ):
Phage the untouchableWrexial, the Risen deepBaleful Strixwillbendervesuvan shapeshifterphyrexian metamorphleyline of anticipationwhispersilk cloakdauthi embracenether traitorGraveyard hate (3):
Dimir doppelgangerskullsnatcherNezumi graverobberLands (38):
Creeping Tar Pithall of the bandit lordminamo, school at water's edgeetc.